Search "die rise" in Call of Duty: Black Ops II - Uprising Tags :

Easter Egg - Toy-Box Perm-a-Perk

This one was named by me, I don`t know it`s actual name but it all ways gives you great guns out of the box. All you have to do is find and roll the box until you get the teddy bear, BUT DON`T TAKE ANY GUNS. Next find and roll the box one more time and take the gun the green spark will appear and a teddy bear will appear on top of the box and from now on when you roll the box this match you will get better guns more often.